Understanding Electrical Technology Concepts

What is the unit of electrical resistance?

• Ampere

• Ohm

• Volt

• Watt

Which of the following is a safety device used to prevent electrical overloads?

• Resistor

• Capacitor

• Circuit Breaker

• Transformer

In a DC circuit, what is the relationship between voltage (V), current (I), and resistance (R)?

What is the primary source of energy in a coal-fired power station?

• Nuclear

• Solar

• Chemical

• Wind

Which of the following materials is commonly used as a conductor in electrical circuits?

• Rubber

• Glass

• Copper

• Wood

What is the frequency of the AC mains supply in Great Britain?

• 50 Hz

• 60 Hz

• 100 Hz

• 120 Hz

Which law states that the induced electromotive force in any closed circuit is equal to the rate of change of the magnetic flux through the circuit?

• Ohm's Law

• Faraday's Law

• Coulomb's Law

• Kirchhoff's Law

What is the main purpose of an earth wire in electrical installations?

• To provide power

• To prevent electrical shock

• To increase voltage

• To reduce current

Which of the following is a characteristic of a parallel circuit?

• The current is the same through all components

• The voltage is the same across all components

• The resistance is the same across all components

• The power is the same across all components

What is the unit of electric power?

• Joule

• Newton

• Watt

• Coulomb